diff --git a/src/Lib/Utils.hh b/src/Lib/Utils.hh
index 3c9bf0e873ed8cda00982d6e3919be0719c56f4c..1592afa4a5dd83294d1506ce32cdab4bf58224c2 100644
--- a/src/Lib/Utils.hh
+++ b/src/Lib/Utils.hh
@@ -37,8 +37,9 @@ concept PropertyConstViewable = requires(T element)
 
 namespace Vivy::Utils
 {
-static const QStringList audioFileSuffix = { "wave", "wav", "ogg", "mp3", "m4a" };
-static const QStringList videoFileSuffix = { "mkv", "mp4" };
+static const QStringList audioFileSuffix = { "wave", "wav", "ogg",  "mp3",  "m4a",
+                                             "opus", "mp2", "aiff", "flac", "alac" };
+static const QStringList videoFileSuffix = { "mkv", "mp4", "mov", "avi", "av1", "m4v", "flv" };
 static const QStringList assFileSuffix   = { "ass" };
 static const QStringList vivyFileSuffix  = { "vivy" };
 
@@ -53,14 +54,24 @@ enum class DocumentType : quint64 {
     OGG  = (1 << 4),
     MP3  = (1 << 5),
     M4A  = (1 << 6),
+    OPUS = (1 << 7),
+    MP2  = (1 << 8),
+    AIFF = (1 << 9),
+    FLAC = (1 << 10),
+    ALAC = (1 << 11),
 
     /* Video */
-    MKV = (1 << 7),
-    MP4 = (1 << 8),
+    MKV = (1 << 12),
+    MP4 = (1 << 13),
+    MOV = (1 << 14),
+    AVI = (1 << 14),
+    AV1 = (1 << 15),
+    M4V = (1 << 16),
+    FLV = (1 << 17),
 
     /* Meta-types */
-    Audio = (WAVE | OGG | MP3),
-    Video = (MKV | MP4),
+    Audio = (WAVE | OGG | MP3 | M4A | OPUS | MP2 | AIFF | FLAC | ALAC),
+    Video = (MKV | MP4 | MOV | AVI | AV1 | M4V | FLV),
 };
 
 template <typename E>
diff --git a/src/UI/DialogHelp.cc b/src/UI/DialogHelp.cc
index 1eabd5c73d68bd6c479fec5db26206813c92f41a..bd0abab31efb949dabe7df5a357e9eedb98b9953 100644
--- a/src/UI/DialogHelp.cc
+++ b/src/UI/DialogHelp.cc
@@ -8,6 +8,21 @@
 
 using namespace Vivy;
 
+// See https://doc.qt.io/qt-5/richtext-html-subset.html for the supported
+// rich text subset.
+static const char *aboutContentHeader =
+    "<body>"
+    "<h1>About Vivy</h1>"
+    "<p>Vivy is a replacement for Aegisub, writen in Qt5+and with less segfaults - hopefully.</p>"
+    "<p>The following libraries where used:</p>"
+    "<ul>"
+    "  <li>Qt5</li>"
+    "  <li>libavutils</li>"
+    "  <li>libavcodec</li>"
+    "  <li>libavformat</li>"
+    "</ul>";
+static const char *aboutContentFooter = "</body>";
+
 DialogHelp::DialogHelp(QWidget *parent) noexcept
     : QMessageBox(parent)
 {
@@ -18,8 +33,22 @@ DialogHelp::DialogHelp(QWidget *parent) noexcept
     setSizePolicy(sizePolicy);
 
     setTextFormat(Qt::RichText);
-    setText(aboutContent);
+    setText(getAboutContent());
     setTextInteractionFlags(Qt::NoTextInteraction);
 
     adjustSize();
 }
+
+QString
+DialogHelp::getAboutContent() const noexcept
+{
+    QString ret;
+    ret = aboutContentHeader;
+
+    ret.append("<p>Vivy will handle the following most of the video and audio formats.");
+    ret.append("The audio formats are: " + Utils::audioFileSuffix.join(", "));
+    ret.append("The video formats are: " + Utils::videoFileSuffix.join(", ") + "</p>");
+
+    ret.append(aboutContentFooter);
+    return ret;
+}
diff --git a/src/UI/DialogHelp.hh b/src/UI/DialogHelp.hh
index 1ab9c7d9f3eff84d837438671f09b3b9a9ba917c..0bb5d9e09810ba60765cc462ae16237ccca8814e 100644
--- a/src/UI/DialogHelp.hh
+++ b/src/UI/DialogHelp.hh
@@ -18,22 +18,7 @@ public:
     ~DialogHelp() noexcept = default;
 
 private:
-    /* See https://doc.qt.io/qt-5/richtext-html-subset.html for the supported
-     * rich text subset. */
-    // clang-format off
-    static inline const char *aboutContent =
-        "<body>"
-        "<h1>About Vivy</h1>"
-        "<p>Vivy is a replacement for Aegisub, writen in Qt5+and with less segfaults - hopefully.</p>"
-        "<p>The following libraries where used:</p>"
-        "<ul>"
-        "  <li>Qt5</li>"
-        "  <li>libavutils</li>"
-        "  <li>libavcodec</li>"
-        "  <li>libavformat</li>"
-        "</ul>"
-        "</body>";
-    // clang-format on
+    QString getAboutContent() const noexcept;
 };
 
 }